Majority of humans requiring radioprotection in medical center are healthy. The most important thing is consummate radioprotection and facilities for environmental protection, and scientific arrangement of staffs and rooms as well.

Positive ratio of chest X-ray is analysed to explore whether it is reasonable chest X-ray in annual physical examination.

BACKGROUND:Anterior decompression, bone graft fusion, plate and screw fixation are commonly used in clinic for the treatment of thoracolumbar burst or comminuted fractures. The posterior surgery including decompression laminectomy and pedicle screw internal fixation.
OBJECTIVE:To explore the biomechanical changes of spine after thoracolumbar fracture and dislocation treated with pedicle screw internal fixation.
METHODS:Forty-six patients with thoracolumbar fracture and dislocation were treated with pedicle screw internal fixation, and then the recovery of spinal cord injury and fracture reduction were observed after internal fixation, immediately after internal fixation and 1-year fol ow-up.
RESULTS AND CONCLUSION:Al the 46 cases were fol owed-up. Frankel function classification assessment was used to evaluate the spinal cord injury grade. There was no significant difference in the percentage of A grade between periods (P>0.05), and there were significant differences in the percentage of B-E grades when compared between immediately postoperative period, 1-year fol ow-up period and preoperative period (P<0.05), but there was no significant difference when compared between immediately postoperative period and 1-year-fol ow period (P>0.05). The anterior height percentage, posterior height percentage and Cobb angle indicators were used to assess the fracture reduction, and the results showed there was no significant difference in posterior height between periods (P>0.05), and there was significant difference in Cobb angle when compared between immediately postoperative period, 1-year fol ow-up period and preoperative period (P<0.05), but there was no significant difference between immediately postoperative period and 1-year fol ow-up period (P>0.05). The results indicate that pedicle screw internal fixation system for the treatment of thoracolumbar spinal fracture and dislocation is conducive to the fracture reduction and functional recovery.

Objective:To study the influences of astragulas(黄芪) on cerebroischemiareperf usion injury in gerbils.Methods:The cerebral tissue delayed neuron death(DND) models of gerbil were established by means of ligating bilateral carotid arteries for 15 minutes then reperfusing for 48 hours and divided into shamoperation(SO) group,ischemiareperfusion(IR) group and astragulas injection (AI，黄芪注射液) group.The activities of Na ＋K＋ATPase and nitric oxide synthase(NOS) and the changes in contents of nitric oxide(NO) and excitat ory amino acid(EAA) in cerebral tissue were compared in different groups.Results:(1)In comparison with SO group the activities of Na＋K＋ATPase in IR and AI group were obviously decreased furthermore the decreases in IR group were mo re significant than those in AI group(all P<0.01).(2) The changes in co nten ts of lactic acid(LD) in cerebral tissue in all the groups had not statistically significance.(3)In comparison with SO group the activitis of NOS and the conten ts of NO in IR and AI group were reduced but the reductions in IR group were muc h more significant (P<0.05).(4)The contents of glutamic acid(Glu) in IR and AI group were higher than those in SO group and the increases in IR group w .05),meanwhile they in IR group were higher than those in AI group but the di fference was not significant.(6)Among all the groups the contents of γam inobutyric a cid (γGABA) and glycine(Gly) had not significant differences (all P>0.05).Conclusions:The mechanisms of astragulas on anticerebral ischemiareperfusion inj ury may be related to its preventing the reductions of activities of Na＋K ＋ATPase,NO S,and the decreases in synthetic volume of NO as well as its heightening the con tents of EAA after ischemia of brain tissue.

Objective: To investigate the feasibility and operative effect of the one-stage microsurgery for clipping of bilateral posterior communicating artery aneurysms (BpcoAA). Methods: The clinical data of 28 patients with BpcoAA were analyzed retrospectively. All patients underwent craniotomy and microsurgical clipping of BPcoAA via unilateral pterional approach. The patients were followed up for 6 months to 3 years after microsurgery. The head 3 D-CTA of the patients and their general conditions were reexamined. The Glasgow outcome scale (COS) scores were used to assess the prognosis. Results: Circled digit oneGood preoperative 3D-CTA showed 28 cases with 56 aneurysms, the aneurysms were clipped completely in 24 cases, the contralateral aneurysms were not clipped completely in 3 cases, the aneurysm was not clipped completely on the approach side in 1 case, and none of the patients died. The aneurysms ruptured in 8 cases on the approach sides during the microsurgery. Circled digit twoAfter microsurgery, 7 cases had hydrocephalus, and 5 had vasospasm on the approach sides and 3 on the contralateral sides, 3 suffered pulmonary infection, and 2 had oculomotor nerve injury on the contralateral sides. Circled digit threeThe mean follow-up time of the patients was 1.7 years. The GOS scores: 5 points in 10 cases, 4 points in 7 cases, 3 points in 9 cases, and 2 points in 2 cases. There were no aneurysm recurrence and new aneurysm formation. The patients whose aneurysms were not clipped completely had no recurrence of bleeding. Conclusion: According to 3D-CTA examination, using unilateral pterional approach, aiming at the location of the optic chiasm and the contralateral aneurysm pointing, the one-stage microsurgery for clipping of BpcoAA is safe and feasible.

Objectives Research into effect on PBL model in prosthodontics education.Methods The PBL model was performed in education of a part of prosthodontics,and education effect was evaluated by table analysis.Results PBL model is proved to be better than the multimedia education model in the training of students'self-study ability,learning initiative,problem-analyzing and problem-solving competence,and the team spirit etc.Conclution Comparaed with the multimedia education model,PBL model is of significance in some respects.

Heart Neoplasms ; pathology ; Humans ; Solitary Fibrous Tumors ; pathology ; Tumor Burden

1.0 mmol/L).The clinical side effects after medication circa were compared between two groups.Results There was no significant difference in myelosuppression,liver functional lesion,gastrointestinal tract reaction and infection in 2 groups.But following the increase of MTX blood drug level,the incidence rate of skin mucosa contamination,electrocardiographic abnormality,the cardiac creatase abnormity and nervous system symptoms significantly increased.Conclusions In the course of child ALL treatment with HD-MTX+CF,the side effects are common and individual difference is obvious.Specific treatment on individuals is suggested.J Appl Clin Pediatr,2006,21(3):170-171

BACKGROUND: Researchers in China and abroad have done a lot of experiments to study the bond strength of dentine adhesives from generation one to six,which have received satisfied results. However,there are still no reports about the bond strength of the seventh generation adhesive (Adper EasyTM one). OBJECTIVE: To evaluate the bond strength of the Adper EasyTM one to normal dentine and caries-affected dentine,and to compare the results with total-etching adhesives. METHODS: A total of 12 healthy posterior teeth were randomly divided into group A and B; 12 posterior teeth with chronic occlusal caries were divided into group C and D. Adper EasyTM one was applied for group A and C,while Single bond 2 for group B and D. The modes of group A,B,C,D were subjected to microtensile bond strength test. Interfacial morphologies were analyzed by Stereo-Microscopy. RESULTS AND CONCLUSION: The microtensile bond strength of group A and B was (21.84±3.98),(27.10±4.85) MPa,which was (16.44±3.46) and (21.48±4.85) MPa in the group C and D. The differences between group A and B,group C and D,group A and C,as well as group B and D were statistical significant (P < 0.05). Failures mostly occur along the resin-dentine interface. The total-etching adhesives performed more effectively to both normal dentine and caries-affected dentine than Adper EasyTM one. For the same adhesive,the healthy dentine yielded higher bond strength than the caries-affected dentine.

Objective To study the adverse effects of air pollution on children's health. Methods Based on statistical data on monthly outpatient visits of Shanxi Provincial Children Hospital, the monitoring data on air pollution and meteorological factors during 1995～1997 in Taiyuan, a correlation analysis on the levels of air pollutants and monthly children outpatient visits was carried out. Results The monthly means of both TSP and SO2 were over the National Air Quality Standard of grade Ⅱ. The level of TSP in air was 1.77 times as high as the national standard. The children outpatient visits to department of internal medicine made up the largest proportion in the hospital (60.72%). Canonical correlation analysis revealed that the levels of SO2 in air gave a greatest contribution (?=0.9901), air temperature did less than air humidity, and the levels of air pollutants did more than meteorological factors to children health damage. Compared with different departments in hospital, the outpatients of department of internal medicine provided the largest share in the total outpatients visits (?=2.2793), then did the emergence department of internal medicine (?=1.9201). Conclusion The more close correlation of air pollution and the children outpatient visits was mainly observed between the levels of SO2 and the outpatient visits to the departments of emergency and internal medicine. The air pollution in Taiyuan had caused adverse effects on children's health to a certain extent.